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| PIERANGELI, M.A.P.; GUILHERME, L.R.G.; OLIVEIRA, L.R.; CURI, N.; SILVA, M.L.N.. |
| A adsorção/dessorção de metais pelos solos é afetada por vários fatores, dentre os quais, a concentração salina da solução do solo. Este estudo teve o objetivo de avaliar o efeito da variação da força iônica da solução de equilíbrio (I) sobre a adsorção/dessorção de Pb por Latossolos brasileiros. Amostras do horizonte A foram colocadas para reagir com Pb(NO3)2 0,15 mmol L-1 em Ca(NO3)2 5 e 50 mmol L-1 (pH 5,5; I = 15 e 150 mmol L-1; relação solo:solução 1:100), durante 72 horas. Em seguida, as amostras foram colocadas para dessorver em Ca(NO3)2 5 mmol L-1. Dos 17 Latossolos, apenas seis apresentaram diferenças significativas entre as quantidades adsorvidas nos dois valores de I. As correlações significativas obtidas entre as quantidades adsorvidas e alguns... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Metal pesado; Ions; Processo de transporte no solo; Poluicao do solo; Heavy metal; Soil transport processes; Soil pollution. |
| Ano: 2001 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/103969 |
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| CERDEIRA, A. L.; PESSOA, M. C. P. Y.; BOLONHEZI, D.; GOMES, M. A. F.; SPADOTTO, C. A.; SOUZA, M. D. de; FERRACINI, V. L.; QUEIROZ, R.H.C.; LANCHOTE, V. L.; QUEIROZ, S. C. do N. de; F. NETO, C.. |
| The region of Ribeirão Preto City located in São Paulo State, southeastern Brazil, is an important and highly mechanized sugar cane producing area. It is also an important recharge area of the Guarany aquifer, which provides water to several cities and rural communities in the region. Research has been conducted in this region since 1995 to assess the behavior of herbicides, such as atrazine, simazine, ametryn, tebuthiuron, diuron, 2,4-D, picloram, and hexazinone, applied in the area. Nitrate applied as nitrogen fertilizer was also evaluated. Espraiado watershed, located over the recharge area, was chosen for this study. Water samples were collected from seven wells located inside the watershed and from surface water of Espraiado stream. Other samples were... |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Águas subterrâneas; Poluição da água; Qualidade da água; Agricultura; Water pollution; Groundwater contamination; Agriculture; Soil transport processes. |
| Ano: 2007 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/15666 |
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| LANGENBACH, T.; INÁCIO, M.V. de S.; AQUINO, A.M. de; BRUNNINGER, B.. |
| O objetivo deste trabalho foi estudar a importância da minhoca Pontoscolex corethrurus na distribuição do pesticida dicofol em um Argissolo. Como modelo foram utilizados microcosmos contendo solo tamizado e acondicionado na densidade 1,25 g cm-3. Em microcosmos com e sem Pontoscolex corethurus, foram aplicados 14C-dicofol, e após um período de 52 dias fez-se uma simulação de chuvas torrenciais. Na camada de 0-1 cm, recuperou-se 75% da radioatividade no solo sem minhoca, e no solo com minhoca, a recuperação foi 9% inferior. Nas camadas mais profundas, os valores da radioatividade ficaram abaixo de 20%, e as diferenças entre os tratamentos não ultrapassaram 2%. Esta espécie de minhoca, muito freqüente no Brasil, mostrou não ter influência relevante na... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Pesticida; Organoclorados; Fauna do solo; Radioatividade; Transporte no solo; Poluição do solo; Pesticides; Organochlorides; Soil fauna; Radioactivity; Soil transport processes; Soil pollution. |
| Ano: 2002 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/108814 |
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| OLIVEIRA, M.W. de; TRIVELIN, P.C.O.; BOARETTO, A.E.; MURAOKA, T.; MORTATTI, J.. |
| A lysimeter experiment was carried out with sugarcane aiming to evaluate the leaching of nitrogen derived from either urea (15N) or the soil/sugarcane crop residues. The leaching of K+, Ca2+, and Mg2+ was also evaluated. The experiment was a factorial 2x4. The influencing factors were: firstly, the differential addition of two kinds of sugarcane remains to the soil, simulating conditions of cane- plantation renewal after the cane crop harvest, with and without previous straw removal by burning; secondly, four doses of N: 0, 30, 60, and 90 kg ha-1. During the experimental period the total volume of water received by the sugarcane-soil system was 2,015 mm, with 1,255 mm as precipitation and 760 mm as irrigation. The loss of N by leaching from the fertilizer... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Fertilizers; Mineral nutrients; Soil transport processes; Lysimeters. |
| Ano: 2002 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/107417 |
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| Oliveira,Mauro Wagner de; Trivelin,Paulo Cesar Ocheuze; Boaretto,Antônio Enedi; Muraoka,Taskashi; Mortatti,Jeferson. |
| A lysimeter experiment was carried out with sugarcane aiming to evaluate the leaching of nitrogen derived from either urea (15N) or the soil/sugarcane crop residues. The leaching of K+, Ca2+, and Mg2+ was also evaluated. The experiment was a factorial 2x4. The influencing factors were: firstly, the differential addition of two kinds of sugarcane remains to the soil, simulating conditions of cane- plantation renewal after the cane crop harvest, with and without previous straw removal by burning; secondly, four doses of N: 0, 30, 60, and 90 kg ha-1. During the experimental period the total volume of water received by the sugarcane-soil system was 2,015 mm, with 1,255 mm as precipitation and 760 mm as irrigation. The loss of N by leaching from the fertilizer... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizers; Mineral nutrients; Soil transport processes; Lysimeters. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000600016 |
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| CERDEIRA, A. L.; SOUZA, M. D. de; BOLONHEZI, D.; QUEIROZ, S. C. do N. de; FERRACINI, V. L.; LIGO, M. A. V.; PESSOA, M. C. P. Y.; SMITH JR, S.. |
| The Guarany aquifer located in South America has a dimension of approximately 1,200,000 Km2 and spreads to areas of eight Brazilian states plus parts of Argentina, Uruguay and Paraguay. The region of Ribeirao Preto City, located in Southeast of Brazil, Sao Paulo State, is a sugarcane, soybean, peanuts, and corn producing area. This region is also an important recharge area to the aquifer. Intensive farming on the area has demanded constant use of herbicides and fertilizers. Triazine herbicides such as atrazine, ametryn, and simazine are used on the area and are known to have potential for groundwater contamination. Currently most of the sugar cane crop is mechanically harvested without burning. This practice allows the straw to decompose in soil, maintain... |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Águas subterrâneas; Hidrologia; Groundwater; Hydrology; Soil transport processes; Nonpoint source pollution. |
| Ano: 2005 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1020673 |
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